Principles of Operation (How Does It Work?)

Power Window Control
The driver power window one-touch down operation is controlled by the Driver Door Module (DDM), if equipped with remote keyless entry, or the one-touch down module if not equipped with remote keyless entry. The one-touch down operation is requested of the module by momentarily pressing the driver window down switch for 32 ms to 480 ms. The module uses the initial voltage input from the down switch to begin one-touch down operation. If the voltage input was less than 480 ms, the module will maintain the voltage supply to the motor down circuit. Maxi-fuse 28 (20A) supplies the power to the module for this operation. The module will maintain the operation until:
^ seven seconds expire.
^ the module detects motor stalled by monitoring the current draw.
^ a voltage input is received by the module on either the up or down switch circuits.

The ground for one-touch down operation does not pass through the module. The ground is supplied through the driver window switch as with normal operation. If the module continues to detect voltage on the down circuit for more than 480 ms after initial activation, the module will not affect operation. The down circuit through the module is a direct connection to the motor in its normal state. This allows the driver window switch to control the motor for normal operation.

The passenger window motors are hardwired directly to the window regulator control switches.

Heated Rear Glass
The heated rear window is controlled by the Lighting Control Module (LCM). The ignition switch must be in RUN for the heated rear window to operate. Pressing the heated rear window switch grounds the input to the LCM. The LCM detects the line at ground and checks the ignition switch position. If the module detects the ignition switch in RUN, ground is supplied to the heated rear window relay output. The heated rear window relay coil is energized which closes the contacts and supplies power to the rear window and the ON indicator on the heated rear window switch.